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In addition to the method you've tried here, the FAQ also provides documentation on closing a filehandle using the syscall directly.

# from perlfaq5 require ’sys/’; $rc = syscall(&SYS_close, $fd + 0); # must force numeric die "can’t sysclose $fd: $!" unless $rc == -1;

The method you tried didn't work for me either (which makes me wonder why it's in the FAQ), but this one did. Here is the test script I used:

#!/usr/bin/perl -w require 'sys/'; $| = 1; open(OUT, ">foo"); &CloseAllOpenFiles(); print "done with close.\n"; sleep 20; # go look at process with lsof to see if fd still open sub CloseAllOpenFiles { for my $fd (0 .. 1024) { my $rc = syscall(&SYS_close, $fd); warn "Can't sysclose $fd: $!" unless $rc == -1; } }

We're not surrounded, we're in a target-rich environment!

In reply to Re: How to close all open file descriptors after a fork? by jasonk
in thread How to close all open file descriptors after a fork? by nneul

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